[EPM] Use index templates v2 (elastic#64305) (elastic#64653)

* Install prebuilt index templates as v2

* Correctly handle pre-build v1 index templates

* Generate index templates v2 during package install

* Update unit tests for index template v2

* Fix imports.

* Fix types.

* Use index template v2 API for template deletion

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/plugins/ingest_manager/common/types/models/epm.ts

@@ -32,6 +32,7 @@ export enum KibanaAssetType {
 }
 
 export enum ElasticsearchAssetType {
+  componentTemplate = 'component-template',
   ingestPipeline = 'ingest-pipeline',
   indexTemplate = 'index-template',
   ilmPolicy = 'ilm-policy',
@@ -246,6 +247,7 @@ export enum IngestAssetType {
   DataFrameTransform = 'data-frame-transform',
   IlmPolicy = 'ilm-policy',
   IndexTemplate = 'index-template',
+  ComponentTemplate = 'component-template',
   IngestPipeline = 'ingest-pipeline',
   MlJob = 'ml-job',
   RollupJob = 'rollup-job',
@@ -261,12 +263,17 @@ export interface IndexTemplateMappings {
   properties: any;
 }
 
+// This is an index template v2, see https://github.com/elastic/elasticsearch/issues/53101
+// until "proper" documentation of the new format is available.
+// Ingest Manager does not use nor support the legacy index template v1 format at all
 export interface IndexTemplate {
-  order: number;
+  priority: number;
   index_patterns: string[];
-  settings: any;
-  mappings: object;
-  aliases: object;
+  template: {
+    settings: any;
+    mappings: object;
+    aliases: object;
+  };
 }
 
 export interface TemplateRef {

x-pack/plugins/ingest_manager/public/applications/ingest_manager/sections/epm/constants.tsx

@@ -21,6 +21,7 @@ export const AssetTitleMap: Record<AssetType, string> = {
   'ingest-pipeline': 'Ingest Pipeline',
   'index-pattern': 'Index Pattern',
   'index-template': 'Index Template',
+  'component-template': 'Component Template',
   search: 'Saved Search',
   visualization: 'Visualization',
   input: 'Agent input',